1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f64b8a1769649e23efb5884ca57c70cfa7ea8847c6e6302a5e907a3086f370. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb05b542-29c8-410c-ac75-db0e9a5b3986.json and https://artists.proofprofile.net/proofs/artist/cb05b542-29c8-410c-ac75-db0e9a5b3986.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c1cb8db4c4e6814bcb87efc6e3f8ed2ee65da43142d7886f57ec11a9b8af32. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUDJ01501460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f0a3185573b65c18b046a43368fee3ec3c38bdb979b1a315da8fea8666400a2. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUVWE1700330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45541b1ed06f5b20bc0835c14f4adf7aae553f46da731b781c552047cd68e0a1. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUVWE1700331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeafdc9292a2040c447796e6f8a0137c58c3edd1814802557b2e74ca622bd1f50. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUVWE1700332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3e063b8a5cb6a8e7d6b6344addf7bbadd8ca9af5bcb04a8a45bb8933a93e885. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUVWE1700326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1ee0c3473a44bfde5855966ff5fb0fe532ab479244c72c87ba3184e8b452c2. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUVWE1700328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d630f5f43bd4bdb7682afc93c865186e8f8d2a488f8b4d2e6f2a92f5845ddf. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUVWE1700329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b57a271e90d1b8913285145330670f9a4a9ffbf1b898f0c39204e0eaec5408. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUTZK1700121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57988b0692f6ca5641d9a037506a7b56b830433558ada3919d647426a427728d. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUTZK1700122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ca80e8bc2639eec4f25e5621ddc37074778e24d02779681fec850e2748de28. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUTZK1700123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda8a0d2dbac1749d643998b6cf0a84735b6f6299958b295ec0e6d1059bd8a3fb. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUTZK1700124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3b95a8101dc92606a357d67f6e4d4851418bf38887ebed97c0414515392bab. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUTZK1700126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe382464b276ab5f2eff056ac16f3fe02c28feb346dc807668782711644375156. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKRNU2100953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c245418b41cc12af2a0d7b6ccb46e9f0655552e98b0a7c293e2aca080925a33. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKRNU2100954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9705266bdfb42e9f733e81bad3bdfa40837acc40d55d3cf7eb88e887354193fc. Chain 2 (Bitcoin): anchored in block 957695 (2026-07-12T11:16:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKRNU2100955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9230ef068f64122f01e5eda4ca70e4d033d59ebb188607c7dc6cd288a1316900. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKRNU2100956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb23f716a6849c86034b4e32af310eb4a4159b6d990d547ddbbc6161f74576caf. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKRNU2100957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08e69a4ba19f9ea112a06e6eff78cb4f65b275560e9b0808610ce90ecc7b7f4. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKRNU2100959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc44ab7d80ff6b29558f3bc6f2f88294a79edf6b099af31c7cc72e4822514622f. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKRNU2100960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9705266bdfb42e9f733e81bad3bdfa40837acc40d55d3cf7eb88e887354193fc. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKRNU2100955.